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<html>

<head>
    <meta charset="utf-8">
    <title>滤波器</title>
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<style>
    body{
        background: rgb(50, 54, 57);
    }
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<body>
    <br><button name="dial" id="dial" onclick="_play()">start</button>　　<button name="dial" id="dial" onclick="_close()">stop</button>

    <div>
        <span>二阶滤波器：</span><input id="createBiquadFilter_gain" type="range" max="40" min="1" value="25" step="1" />
        <p id="createBiquadFilter_gain_value">25</p>
    </div>
    <script src="index.js"></script>
</body>

</html>